Missing Long Island teen Thomas Medlin was caught on surveillance video pacing the Manhattan Bridge — moments before the cameras recorded an ominous splash in the East River, Suffolk County police revealed Wednesday.

Cops stopped short of saying that the 15-year-old boy from St. James — who vanished after leaving school on Jan. 9 — somehow plunged into the icy waters, but noted that the footage does not show the teen leaving the bridge.

Image of a missing boy named Daniel.
Thomas Medlin, 15, left school on Long Island on Jan. 9 and headed into Grand Central Terminal.Suffolk County Police Department
A snowy landscape with the Manhattan Bridge looming overhead, featuring people walking a dog in the foreground, and hazy buildings in the distance.
Suffolk County police said Medlin was last seen on the Manhattan Bridge hours after leaving his school on Jan. 9.Deccio Serrano/NurPhoto/Shutterstock

“There is no indication of criminal activity,” police said in a press release. “Detectives have continuously communicated the department’s findings to Medlin’s family. The department is continuing to work with its law enforcement partners to bring closure.”

The chilling new details offer the first hints of Medlin’s fate since he went missing after leaving Stony Brook School, a ritzy prep school that can cost more than $70,000 for students who live on campus.

Police said the teen walked off his school campus around 3:30 p.m. on the day of his disappearance and hopped on a Long Island Rail Road train to Grand Central Terminal in Manhattan, where he was first spotted on security cameras.

According to the Suffolk County Police Department, cameras then captured the teen on the pedestrian walkway on the Manhattan Bridge at 7:06 p.m. — with his last mobile phone activity recorded at 7:09 p.m.

“A nearby surveillance camera captured a splash in the water” just a minute later, at 7:10 p.m.,” police said.

Thomas Medlin and his mother in a snowy, wooded area.
Eva Yan told Fox & Friends this week that she wanted her son, 15-year-old Thomas Medlin, to return home.Family Handout

“Medlin was never seen leaving the bridge via path exits.”

Law enforcement sources said investigators had been pinging the boy’s phone but lost contact at that time.

Illustration of a child holding a smartphone displaying the Roblox logo and game thumbnails in front of a screen with a Roblox character.
Police initially believed Thomas Medlin was meeting a friend he met on the gaming platform Roblox.REUTERS

The teen’s mom, Eva Yan, pleaded on Fox & Friends Tuesday for her son to come home, promising, “he’s safe. Nobody’s going to harm him.”

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Investigators initially believed Medlin ventured into the city to meet someone he met through the online gaming platform Roblox, but police said they later ruled out any connection between the site and the disappearance.

Roblox told The Post over that weekend that it was cooperating fully with the investigation.

“We are deeply troubled by this incident and are working with law enforcement to support their investigation,” a company spokesperson said in the statement.